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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '777d90fcfbe4f0984d3317bfac8eae7828b623ce71a251144a962c934bbdddd4' 
  AND token = 'VqKEyrZbAG4jyyVeUc6D2vxps+TVjs6NDmT0bZ6vKr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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