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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26899bb3d2ca511ada41385b0b0b644e8aa8cdf5b0c4ebc5e87a3f7573401fd5' 
  AND token = 'QQ9pDGE1886uNrDC1UeYZ6iIYsnJmubtCnW6/oJK9eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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