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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1aca513105729f129f356f8f6955353a96551dd7083abeac9523f65286e3a5dd' 
  AND token = 'yJNPMcPif0IYqhakWBUIrwbuSaTFzzVOTIAjG3Fx72o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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