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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6809ff37975ec566c1a6343953bb90d78ae98d94f6149f413d40aa3918ce7987' 
  AND token = 'NvIa7MIY6evPXtJVtmd8yH1EqfvWEq4639zDk88iv9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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