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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2245696d972ba26e490c40d9500fd3855edcd83f547edcce569743ab78f2ac37' 
  AND token = 'QhsZ3TPw2WnPO2Q+zTnpJ01tWJic4SPNBMH9/uykoVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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