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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f79bc672b294e66d9b02bb51696518a7cb639206a7964a822b94e89df55c467' 
  AND token = 'clWMwyaGCKVMqzy9+NSUqRBqv828SrYerOx226n3PnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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