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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '916da7e8959705c383cef177398cd456aa219001a8206ecc62b6b4441f5fb13c' 
  AND token = 'Gn0ohbennRD/X1fzzKrLcWB5djojFFoS6/rAdH8SNBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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