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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4cadcfbdf7a97029733b8f3d67cb642be51ad73be3fdfc95194909496e457a6b' 
  AND token = '3B8HKHKxW3CQ5yaDSTttLz+94D5WsaxDLi4RO5Frc4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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