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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87a2e4efe7993be0c27f452ca02b5f7e826ffa589592f15bc7b3e485c2ebb873' 
  AND token = 'k9706upJsENNxFB5aVMWATjcsyHg+KREo7FDRMu3sSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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