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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e77e6b441aad6971f74f38945928c1f2c8f58b6a3afa42fcee4f017b2164305c' 
  AND token = 'a3gK7+KSEN0ZO8MEiD0CZerrXDUeNrYCOMa7yIRUUrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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