SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c097c14938b3d6eff8b95ad507490d20451022a6866d9824a886baadf54bb45b' 
  AND token = 'TTgsVrJHOgCIOPz6ZbxBmUOMJCUvjqB2fsq/K5+O/Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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