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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87ec84bba8f79dc7ec5804558c7eab7cfd3e3967f5efaab52bb755b6472ed840' 
  AND token = '65fH7ivNVt2Z4uHw1EiRrFVY5wjehsov8G9wDxIbEpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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