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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b4b24f99f53f6b194579b95cd5ec03a8d2678392b5bea18268fcd8ed684d50a' 
  AND token = 'H5WES3D26UWlfHjD1zLaWp6Sdmc7TCN+NEfc1mBFqmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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