SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfcc4e463f2a5dcc7d69849d1e415f224557202cf02fbb78dfb01b045349996f' 
  AND token = '8e6zKOJmKIvHIOR7UUDFPTDYbNGEuVXs2tPolPr2sOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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