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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '445707e30102f6a6d378f4a6a757c750e6980447714b1bc2ae05f12472df4cb6' 
  AND token = 'hF1Vjw51ojMQl1HN5Zru4v8OkaloAZJbXuVgvQneIfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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