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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44eeed49f50c6bdcc7cc782202b3ec8d23ab2ca671cc2ea33ca46b24cb4a8309' 
  AND token = 'KkjBI5QeRb1cOV9Do5PHK20Ri+04gJaREVVT4n4GXec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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