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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5a4a71ca625485759950684f172ee1655a1609de9a44041ff4b66ff709e7ea8' 
  AND token = 'EKaT42S6ONwHTZDqf89IgseSnGF1PtdgUO9nYhnibgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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