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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a0355da85bba704f33984f7f0fb2cb4d879e4d19c94b4f5f4f8e55460a208b2' 
  AND token = '5HEzJbaM9Q7n76qKmvoOxNVY2fkXUe/5L0a1qA7LiXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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