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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f0e1f6c5161f065c830629db6a9b69bcefa06de4d7d89e20f25f79c5adee3eb' 
  AND token = 'A+sQrGzcEFP4mDjb56+12hRWS4lXNWfzTh7hzy290aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}