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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7cec6893167f4f53e0e5a697de26d7a914269b6a9fa83a64c4e67a15a29b21a4' 
  AND token = 'G/aGC1ksxgB7HQY0Av12Q47c3MU7Z9M88NzYLSGmPR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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