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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '872cbf2c78b345705f51f48e4143c19d20aca587b27ec0f17c390d3838bd5d00' 
  AND token = 'HwXk3AOnHZfokBpnEcTKKVCV1wcewum1vaX8Xok2SSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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