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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '073f44a3409e9785477f87cf2980de5234f48e04c70055ec03cc6bf75418e0a1' 
  AND token = 'IhdxiNbEaeDC9wV8cBTNI79krF4KCXoE6j74+2PjZnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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