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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00698bbf4558a4dd3b78e1929bf640ef637e89e4d14633593ac1a6e25bb06d02' 
  AND token = '9794wVxyFoXRaQ/9NJczdHyvQQXQV9SF90GiYFm80CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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