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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd82e532871f420bf7aad9b0606fd6ad1d57163b974fb7a040cb4d245398700b6' 
  AND token = 'dAuit5QidgTga4YXv4W5Jc9ctVrwW7W17bZQlDkGMKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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