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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbf59555cd00e5ff1796565e1417dc2d2ea064f1a051f8c07641d91ff9684806' 
  AND token = 'wNwNWsKMadWTIENkmN4Az1Oy69qEWL1nhlt9BWCTGHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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