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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a8e78df78b1fe059aba419f1d9cf996ee41e8103837dc28fa1bd3e28ecfabd8' 
  AND token = '6upWdSrAI+U55KE/jDCLZrD0WY2oibDKyXLJo8HTMlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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