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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1d3cd1a4264cf27b899e05873a83716870dced3b83bac5791be2d6c3efc9ab1' 
  AND token = 'YgbpavDArfPXe64WQj5s2GY80HIwKv1AM5fN8UtFFS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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