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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b61dad8faabcf65e10ea9b86c7a4190076d5e64c004a6bbcf640386c1fb7a63' 
  AND token = 'SULb2ElGOSJe3sjEqsz9PZ9bZjcXWemien6zG1nIfFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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