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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'efbe014b0fc1262dab955051df1240af3ba5baed59a77d31ed8b80e7242bd50a' 
  AND token = 'UMGFauomuW3y3rXlSSEDgFUm6eCQXgxWOmgi2qmENlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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