SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da13bf9359f1b2e201e5db5e38fd04c1d2632af9456f754cdb79a9480c7f881d' 
  AND token = 'hiihr0XEWuwsEUK6y9qlyODqNVLVqB8bLyiyyr5vIgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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