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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d692b574475d81089da0f711afdd3f3fcfa408c750af951fd9a0f78541853d9' 
  AND token = '2RsV1R2Dj0gG70VhdSj9Szqprki8IqyLyYK6mRYuqUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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