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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '958a03fd30a4844eb84e6f988b647d909a16d45154cdcc7af5fed863cc55f708' 
  AND token = 'SBh9UQ14jUtN/ffo4Heq/RgUOcbnSJOl6ZZROnrZKUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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