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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f64fea8274b53b4c3ca839ebfbd899b63300cdd453cd0cc0fa48acd61f9ee8fb' 
  AND token = 'QMxEcWG3oQrYfALl96LHImA0t/CAw7OXuq7rcKI1F+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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