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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '651bb346a77ca98cba7ba94b3266bc7c87e866799d9bb484d60a17fc4b11ec3a' 
  AND token = 'U41mkhWddGO75Pi625daq1Xe2NzfxdO6MjtAz3SACSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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