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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79f65f5a0583fbcc3646c03bf0bd893f566751f01ecc07e0cbb6eda5ec0d6362' 
  AND token = 'fCS0iOWF0TeYWeGd7dEOpIkJErL4Fx1LNjVYtv0Rd90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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