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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e6a01703cbe6f7083a9ffa93daffdb4eca561169ff1b364d08c0a4155dc1dba' 
  AND token = 'amUlifjvDXRJvONL5IQ7OUEgpAZ4PTR06NHjdcwIsiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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