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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33cfdc6a80718cdc357fd59326cc3589a065b560487bffb7eda11a0580b42e1e' 
  AND token = 'Fwd97q21R1awG+wz6F6WIl0FtchYb5pDgJnFshaCmlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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