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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6551bf8331087a78a1fdc1d9dbadd353a09b3f65ba029e4e2b34bae1b07e728c' 
  AND token = '+zOXrdaPXXqaQfzMYFpiAFoinNqFpFibr6joQSNqL6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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