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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '585df696d32e44e7133e8e931c7900f0be147be4d1ed9d995e65687c4134709e' 
  AND token = 'L3cfyKCllkvibtVwDUdqQamimC713/Lh33qRwm/RrGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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