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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c3d77e9bc971a174a6d89dd33c3cf8386d46ef369c309d7c53d64776d919bc4' 
  AND token = 'DwV1H9+ZxfKW/S08nHAQNqBO8YGcct8lzaH+WqBUKzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00228

JSON explain

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