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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '269eb98573408ccfc885786a4e17fa52522e11e11af851b37e642635ea40b0d9' 
  AND token = 'g+CpTklvGEmEM2GXOervDY+PB3bMciWXYT+htW228zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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