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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '535749e6c7d3f45786e45850f45cc9e2538cd55af221f6e157446ffe4c92828d' 
  AND token = 'DQED98yJaaTHergfEY909bPn3fUFOc5yd9Z6aA4Kgdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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