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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1b6c69cb216248f60816a8223a9564ae4b798a0ecd70fbd4b3008999750e12b' 
  AND token = 'syMMLGULqEk2oXkucwMMEp98OmsBehg+CGLx/g7Jr5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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