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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3d49ebd733cf16ebff0bfd1a15cc8dbcaafe0bb928d0e298bf2f71c41dd58a9' 
  AND token = '15BoJeiCaAAsQvyBMVNrJWdwHTUqQaKVQn8oqBA1hSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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