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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b29a30f1c65934efa7caf7fe1f87957d50221651b1a74b4db7e35fbfb1cac02' 
  AND token = 'A7t2f4WkRJ3Xed3+GxEQ6XwJGOeL5Sgt+zciqUNVdoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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