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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0dd8f4336a9ccfafdcd5fd2f4e45c17a7879309e4c68546036be4a33e3a6f409' 
  AND token = 'KKBoToCkdKQnRX/n+96fcXNd+DaPO2ghH95arfJdgHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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