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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce135f4066232ece92a5c94366b26633a18dfcd07ecad3c2baa63ab8628649b1' 
  AND token = '+JdH1RNwNzLXhBczh0fFEM3q9DkLrg0W8cwvTARRsyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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