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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57c5d3fd51dfc3a7d8451584fa417c2474d550a5553fe40d1b9b84c913ed1472' 
  AND token = 'qRe+UNt3Gapo3W6UMH7vos3PGB3yka6y9KgJPTaqokY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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