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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a651aa094dd45dd87ada017c4261e12d5436be12a42c205e3c9359e0e086e0c5' 
  AND token = '4kyZMMZ5zVCBPB87lujDAlqxyqVpOl1I/tSa+HspYWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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