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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e1c42fec987f4cb6232d4aa5aed486e6a7631239930d7263a458a305de3668d' 
  AND token = '5+9h9mEy4uXNh3ZBDiSXA+AZySsNCHHA4a8UbnF16Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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