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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b7bb5889351fc5ff6f6289839dedb1e9c011c8c99d1d60c13e7bdccace0dee0' 
  AND token = '/G+yGcgjVOE5EdGWsuipQAVHWYE892Z+MLwKJUIDXoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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