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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4bbe4a4092d194f9039ceda1b0c38696f62bc2ae69743cc54c1ec9310fb1fae1' 
  AND token = 'wByxxgtYBamV8ZxgpgagQYlp6P1fao7QcYvbp2gl8XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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