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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00f999315b0ae7776d1e2cea070258786781d5e1265081dc9d06e08ee3c0124f' 
  AND token = '5BH1zdYj1QZ3fAXSl90UUwa+hc97IrJsBR/rON0Tg7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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