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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02126775682c98997cbee63fbe6f1bd8988a02e5669ad439beef8f2c3b4ae824' 
  AND token = 'NBWof7XMe64DIeXZ2BuhYAx2IIsZs49FgBEp4mXXAPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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