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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b76744420681a71efe00960b0796dcc3ce2ad8226ef89573401e9fbad48de53' 
  AND token = 'un7/dW+2leg701ae5/h9r4qiJ47eLPbjv3C+ZHKOXlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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