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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd3e5c88ceecee65382ab0cb382544221f40ce77450e2151b69b05083ea0e160' 
  AND token = 'fHV0cQBwN2ttq1Z6fOky5hPIpiL1g4rrcnVynLOleUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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