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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c053ff8702078f22dbca72101bb456a11416e43bd26a15aac49aed0defc4ff91' 
  AND token = 'xM5DMb6cMdBdCiu+UyYhUE+kkPQIqLvNp1UkJbG5k70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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